Beating engine and the like



Aug. 11, 1925.

c. M. NELSON BEATING ENGINE AND THE LIKE Filed Jan. 14, 1922 a i r i I i i i u ""JIIVIJIJI "nlpaaarpnpl Patented-Aug. 11, 19250 1,549,725 TM QFF e CHARLES M. NELSO'N, OF HOLYOKE, MASSACHUSETTS, ASSIGNOR TO E. D. JONES &

SONS COMPANY, OF PITTSFIELD, MASSACHUSETTS, A CORPORATION OF 'MASSA cH sarrs.

Application filed January 14, 1922.

In certain types of beating engines the stock is beaten up or treated in a tub or vat.

These tubs are divided by a partition or midfeather usually located centrally of the tub, a passage being left at each end of the tub between the ends of the midfeather and the tub walls. Onone side of the inidfeather is a bed plate provided with grinding bars with which oo -operates a roll also provided with grinding bars, and a back fall located behind the rollover which the stock is forced by the roll action. The stock is circulated by this action around the tub, the midfeather and the tub walls providing channels through which the stock passes around the tub, the stock passing between the roll andits co -operating bed plate as often as it is necessary to effect the required refining of the stock. H v

In this type of boaters the midfeather, as far as I know, has always been made vertical at'its ends, that is, the ends of the niidfeather have been arranged so as to'be at right angles to the floor of the tub throughout their height. The midfeather, however, has to be ofa certain length to provide suitable channels for the passage of the stock around the tub, and with this prior construction of mid feather with vertical ends the stock as it passes over the back fall and toward the end of the tub is apt to pile up at the back end of the tub between the midfeather and the wall of the'tub fastenthan it is discharged between the'back end of the midfeather and the otherwall of the tub.

'It isa'n especial object of the present in vention to provide an improved form ofn1iclfeatherforxbeating and similar engines of this class in which the mid'feather is so formed as to'provide a'clearance at one end orboth ends so that on a line extending from theends' of the midfeather to the walls of the tub a clearance :is provided which will BEATING ENGTNE AND THE LIKE.

Serial No. 529,151.

facilitate the passage of the stock between the'midfeather endsand the tub walls and relieve the congestion and permit the stock to move freely away,"thereby largely increasing the circulation, and effecting a certain saving of the power consumption required to refine the stock. A

With this and other objects not specifically referred to in view, the invention consists in certain novel parts and arrangements which will be described in connection with them:- companying drawings, and the'novel fea tures will then be pointed out in the claims hereunto annexed.

Referring now to these drawings- Figure 1 is a vertical longitudinal section of a beater showing'one embodiment of the invention. i Figure 2 is a plan view of the beater shown in Figure 1. i

Figure 3 is a detail view partly broken away, of a modification of the lnidfeather end which may be employed. V

Figure 4c is a similar view showing another modification. r Referring now to these drawings, 1 indicates a beater tub having side walls 2 and a bottom 3. This tub is divided longitudinally by a partition or Inidfeather marked 4:, which extends longitudinally of the tub,

this midfeather extending on each side of the beater roll toward the ends of the tub forming channels a, I), through which the stock circulates. On one side of the midfeather is provided the beater roll '5,-pro'- vided with the usual grinding bars or knives 6, this beater roll-being mounted ona shaft 7 extending across the tub and being driven from any suitable source ofpower not illus: trated; Co-operating with the roll 5- is; a bed plate 8 suitably secured in the bottom 3 of the tub, which bed plate is provided with suitable grinding bars, the stock 'or pulp being ground between-the roll-andthi-s bed plate. Closely adjacent the beating roll at the rear or left hand side-thereof is arranged the usual back fall-9 which extends between; one side ofthe tub and-the midfeather 4c, theback fall "in" the particular beater shown extending upwardly-about to a line of the centerof the beater roll, and the roll and'back fall are enclosed by a cover 10, of any suitable character, andadoctor indicated at- 1-0 may be used if desired.

i filhfih particulanbeater hownit eil w rear or left hand portion of the back fall 9 is cut away to form a pressure chamber, indicated at 11, this chamber extending transversely across the tub between the side of the tub and midfeather, the top of this chamber being formed by a plate 12 of any suit-able character secured on the back fall so as to provide a jet opening. The end of this pressure chamber adjacent the side of: the tub is connected with a suitable source of water supply, not shown, by a pipe 13, and from the other end of the pressure chamber, that is the end toward the midfeather extends a connection 14 which passes around the rear or left hand end of the midfeather. By this construction water under pressure may be supplied to the return side of the midfeather so as to stir up and carry pulp or stock which is liable to accumulate against the midfeather on its return side. This construction, with the improved midfeather, ives a most effective stock circulation.

The tub is provided at any suitable place, as for instance the right hand front end, as shown in Fig. 2 with an outlet 15 connecting with a pipe 16 controlled by a valve 17 through which the contents may be quickly removed from the tub.

In accordance with the invention the midieather is formed at one or both ends so that for at least a portion of its height, the line of the end lies at an angle to the vertical with respect to the bottom of the tub, and toward the roll so as to provide a clearance and permit the free circulation of the stock around the ends of the midfeather and prevent the backing up or congestion of stock. This construction will be used whatever the form of midfeather, and while a single midfeather is shown, positioned substantially centrally of the tub, it will be understood that the invention is not to be restricted to this particular form or location of the midfeather. It has been found in practice that midfeather constructed substantially as shown in Fig. 1, gives good results. As there shown, the midfeather extends upwardly from the bottom of the floor vertically for a short distance, as indicated at 16. From the point marked 17 the end of the midfeather is then formed at a sharp angle to the vertical, the midfeather end receding from the vertical toward the roll, as indicated at 18. This gives a wide clearance for the stock, prevents congestion, permits free circulation at the ends, and does not impair the channel forming function of the midfeather. If desired the forward or right hand end of the midfeather may also be formed so as to lie at an angle to the vertical, as indicated in dotted lines at 19, in Fig. 1, if a very tree circulation of the stock is desirable or necessary.

Under certain circumstances it may be desirable to start the slanting or reducing of the end or" the mid'feather from the vertical from a point starting directly at the junction of the midfeather and the bottom of the tub, as shown in Fig. 3.

In Fig. 1 is illustrated a still further form in which the end of the midfeather instead of being straight is curved, as indicated at 20, the curve extending away from the vertical so as to leave a clearance.

In all the figures the vertical line has been shown dotted in to more efiectively show the clearance which is formed by slanting the midfeather at an angle to the vertical.

While the invention has been shown and described in a preferred form, it will be understood that various arrangements of midteather with respect to its position in the tub and with respect to its form between its ends may be employed, without departing from the invention. Furthermore, midfeathers embodying the invention may be employed in heaters, the back fall, beating roll, floor or bottom of which may be constructed otherwise than that illustrated in the drawings, and in which the sides, ends and cover may also be varied in construction from that shown.

What I claim is 1. In a beating engine and the like, the combination of the tub, beating roll, and back fall, of a midfeather extending longitudinally of the tub and dividing the tub into channels having smooth walls, said midteather having one of its ends for at least the major portion of its height formed at an angle to the vertical with res ect to the bottom of the tub, the line of tie end extending toward the beater roll.

2. In a beating engine and the like, the combination 01 the tub, beating roll, and back fall, of a. midteather extending longitudinally of the tub and dividing the tub into channels having smooth walls, said midfeather having each of its ends for at least the major portion of its height formed at an .angle to the vertical with respect to the bottom of the tub, the line of the end extending toward the beater roll.

3. In a beating engine and the like, the combination of the tub, beating roll, and back fall, 01" a. midfeather extending longitudinally of the tub and dividing the tub into channels, said midieather rising vertically at one of its ends from the bottom of the tub for a short distance and then having its end formed at an angle to the vertical with respect to the bottom of the tub, the line of the end extending from the vertical toward the roll.

4. In a beating engine and the like, the combination of the tub, beating roll, and back fall, of a midfeather extending longitudinally of the tub and dividing the tub into channels having smooth walls, said inidfeather having one of its ends for at least the major portion of its height formed at an angle to the vertical with respect to the bottom of the tub, the line of the end extending from the vertical toward the roll, and means for introducing pressure fluid at the end of the midfeather.

5. In a beating engine and the like having a heater roll and bed plate, a longitudinal inidfeather formed with smooth walls having its end behind the roll disposed at an angle toward the roll for at least the major portion of its length.

6. In a beating engine and the like, the

CHARLES M. NELSON. 

